Update app.py

Fix endpoint in f string

app.py

@@ -80,7 +80,7 @@ def captioner(image):
                 f"**{endpoint}**: \n\n {result[0]['generated_text']} \n\n\n "
             )
         else:
-            caption = f"**{model_name.upper()}**: \n\n Error - {result['error']} \n\n\n "
+            caption = f"**{endpoint}**: \n\n Error - {result['error']} \n\n\n "
         captions.append(caption)
     return "".join(captions)  # Join all captions into a single string